The I/O 2018 reveal date is reported by 9to5Google[5] on May 8, 2018; Google[1][2] release notes separately date beta and general availability.
Google introduces its third TPU generation at I/O 2018. Cloud documentation specifies 32 GiB of HBM2 and 123 BF16 teraflops per chip, scaling to 1,024-chip pods.